So originally the show was licensed by FUNimation, with Saban Entertainment financing the dub, and Ocean was doing the actual voice work. Eventually Saban stopped financing the dub, so FUNimation couldn't afford the union actors from Ocean, so they brought in a bunch of non union talent and started doing in house dubs. Let's just say Ocean didn't like that to much so they started doing their own dub for Canadian and UK TV audiences where FUNimation didn't license the show.
This was concurrent with the FUNimation dub as of ep 67 or so.
I'm gonna be using the first names of the Ocean actors. Ian quit doing anime because it pays less than cartoons, and Schemmel got Peter's invite to Kamehamecon retracted because he started throwing a tantrum about how he's the only true voice of Goku. He also tweeted to Kirby that he's not Goku which is mentioned in that video someone linked.
Schemmel is a fucking joke.